Concrete-mixing machine



(No Model.) 2 sheath-sheet 1 E. L. RANSOME. CONCRETE MIXING MACHINE.' l

No. 410,292. Patentedsept. 3,1889;

(NOI/mel.) 2 sheets-sheen 2.

VE. L. RANSOMB.

GONGRBTE MIXING MACHINE. l No. 410,292. Patented Septi 3, 1889.

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UNITED-Y- STATES PATENT) ERNEST L. RANSOME, OF SAN FRANCISCO, CALIFORNIA.

CONCRETE-MIXING MACHINE.

SPECIFICATION forming part of Letters Patent Nd. 410,292, dated September 3, 1889.u .l

' Application led November 16, 1888. Serial No. 291,061. (No model.)

To @ZZ whom it may con/cern.-

Be it known that I, ERNEST L. RANSOME, of the city and county of San Francisco, State of California, have invented an Improvement in Concrete-Mixing Machines; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to improvements in that class of machines in which a rotating case is employed to receive and mix the material to form concrete, and it is especially applicable -to a machine patented to me July 14,

1885, in which a series of lifting shelves or" flanges are fitted within the rotary casing of the mixer.

My invention consists of an automaticallyoperating device by which the shelves or anges may be turned upon their pivot or fulcrum pins, so as to either lie iiat or stand so as to discharge the material when properly mixed.

Referring to the accompanying drawings for a more complete explanation of my invention, Figure l is a side elevation of the mixingdrum, showing the chute, the lever-arms, and the springs. Fig. 2 is a detail showing, in perspective, a portion of the drum, one of the lever-arms, and the springs KK. Fig. 3 is a plan view of Fig. 2 and showing part of the drum in section. Fig. 4t is a front elevation of Fig. 3. Fig. 5 is a sectional View taken transversely through the drum.

A is a hollow drum having openings at each end through which the material is introduced to and discharged from the annular space around the circumference within which the mixing is carried on. Angularly placed fianges are fitted within the drum for the purpose of mixing the material, and a discharge` chute is supported so as to extend through the drum in such a manner as to receive and discharge the material when'properly mixed. The material is lifted to a point where it can be dropped into this chute by means of the shelves or flanges G, which consist of oblong plates mounted upon shafts I-I, about which they may be turned, so as to lie in a position in which they willnot lift the material until it has been properly mixed within the drum. They may `then be turned to stand at such an angle that they will lift the material and carry it up to a point above the dischargechute into which they will drop it.

Upon-the end of each 4of the shafts H isl fixed a double-lever armv I, so that by turning this arm the shaft and the lifting-plate are moved as above described. Upon `each end of this lever-arm I are pins J, which project inwardly or toward the side orange of the drum A. Upon this side of the druln are fixed the two springs K, having the holes A `f` vers are moved. From this point the cndsof` the springs extend a short distance beneath the lever-arm I, and their elasticity causes them to be pressed against the inner faces of the'levers. It will be seen that when the le-` ver I of either of the lifting shelves or flanges is turned so that one of itsl pins J `will drop into the hole L in thecorresponding spring, which is beneath that1end of the" lever, the lifting-ange and lever. will be rigidly held in that position until it be released from the spring. i i g i In order to release either end of the lever I from the corresponding holding-'spring, a

'support N is fixed at one side of the drum A,

and Wit-hin this support is fulcrumed a lever O.. vFrom this lever pins P and Q project, about equidistant from its fulcrum-pin, extending toward the rim of the drum A, as shown, so thatit' one` of the pins is `advanced by moving the lever O in one direction `it will engage one of the springs K and force it inwardly toward the side of the drum so far as to release the pin J von the lever I, which may be engaged with the hole L in the particular spring. If the lever O is moved in the opposite direction, this pointwill` be withdrawn and the other pin will be advanced, andwill actin precisely the same manner upon the opposite spring K. The lever R is fulcrumed so as to operate the lever O whenever desired.

The operation will then be as follows: The

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sition not to lift the material which is being mixed within the drum, the pin J at one end of the lever I will be engaged bythe hole L in the corresponding spring K, and will thus be locked in that position, where it will remain as long as may be desired. Whenever it is desired to turn the flange into a position where it will lift the material so as to drop it into the discharge-spout, the pin Q will be advanced by moving the lever O, and as the.

drum A continues to revolve this pin will engage the inclined portion of the spring K and gradually force the spring inward until the pin J is released from the hole L. The end of t-he pin Q, then passing over the shoulder or offset M, strikes the end of the arm I and turns this arm, and with it the shaft I-I and the lifting flange or shelf within the drum, to a position which will cause it to act to lift the material within the drum. The pin J, upon the opposite end of the lever I, wili then en gage with the hole L upon the opposite spring K, and will hold the Iiange in that position as long as may be desired. Vhen it is desired to release the lifting-ange and allow it to be turned into the position in which it will not lift, the lever O is moved so as to advance the pin P, and this, following the inclination of the other spring K, will force that spring inward until it is clear of the pin J of the lever I at that end. The continued movement of the drum A brings the pin into contact with that end of the lever I, thus turning it in the opposite direction until it is again locked with the other spring, as previously described. At the instant when this locking takes place the lever I is turned so far out of line as to allow the pin P or Q to pass by its end without further action upon it. The shoulders or offsets M upon the springs K are deeper than the length of the pins J, so that as they pass beneath the pin P or Q they will be depressed so far that the pins J will be entirely released from the locking-holes L before the end of the levr I is engaged and moved by the pin P or Having thus described my invention, whatI claim as new, and desire to secure by Letters Patenti, is

l. In a concrete-mixing machine, a hollow rotating drum with the hinged or swinging transverse lifting iianges or shelves on the inner surface of its periphery, in combination with lever-arms fixed to the outer ends of their fulcrum-shafts, and the pins and perforated lockin g-s'p rin gs, whereby th ey are held in their position, substantially as herein described.

2. In a concrete-mixing machine, a hollow rotating drum, in combination with hinged or swinging anges or shelves uponvthe inner surface of its periphery, the transverse arms or levers fixed to their fulcrum-shafts, and the springs adapted to engage andhold the opposite ends of the transverse arms, and having the shoulders or stops M, substantially as and for the purpose herein described.

3. In a concrete-mixing machine, the hollow rotating drum, with the hinged or swinging transverse fianges or shelves upon the inner surface of its periphery, and the transverse arms fixed to the outer ends of their fulcrumshafts, in combination with springs having one end fixed to the side of the drum and the other ends lying beneath the ends of the transverse arms, said springs being inclined away from the side of the drum from their point of attachment to the abrupt shoulders M substantially as herein described. Y

4t. In a concrete-mixing machine, the hollow rotating drum, the hinged or swinging transverse .flanges or shelves upon the inner surface of the periphery, the transverse leverarms, with locking-pins J, and fixed to the fulcrum-shafts of said anges exterior to the drum, and the springs K, with the outward inclin'ation from their point of attachment, in combination with the pins P and Q and the mechanism for advancing said pins alternately, whereby they. move over the inclined surfaces of the springs and gradually force them out of engagement with the locking-pins J, substantially as herein described.

5. In a concrete-mixing machine, the hollow rotating drum, with the adjustable lifting shelves or flanges mounted upon fulcrumshafts within the periphery of the drum, and the transverse levers fixed to the fulcrumshafts exterior to the side of the drum, having locking-pins at opposite ends to engage with correspondingholes in the 4incline-d springs K, which are fixedY to the side of the drum and which have the abrupt shoulders M,as shown, in combination with a lever having pins upon opposite sidesof its fulcrum, which maybe advanced alternately, so as to engage the inclined surfaces of the springs and force them backward so as to release the locking-pins and allow the shelves to be turned, substantially as herein described.

In witness whereof I have hereunto set my hand.

ERNEST L. RANSOME.

Witnesses:

S. H. NoURsE, H. C. LEE.

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